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    <title>Document</title>
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<body>
<h1>这是我的标题</h1>
<img src='http://www.baidu.com/img/PCtm_d9c8750bed0b3c7d089fa7d55720d6cf.png'>
<button onclick="sendMsg()">按钮</button>
<script>
    function UpdateTitle(){
        document.querySelector('h1').innerText='最美IU'
    }
    function sendMsg(){
        objName.objKey(9)
    }
</script>
</body>
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